@article{BUMI_1959_3_14_1_62_0,
author = {Philip Hartman},
title = {On oscillators with large frequencies.},
journal = {Bollettino dell'Unione Matematica Italiana},
volume = {14},
year = {1959},
pages = {62-65},
zbl = {0086.07002},
mrnumber = {104859},
language = {en},
url = {http://dml.mathdoc.fr/item/BUMI_1959_3_14_1_62_0}
}
Hartman, Philip. On oscillators with large frequencies.. Bollettino dell'Unione Matematica Italiana, Tome 14 (1959) pp. 62-65. http://gdmltest.u-ga.fr/item/BUMI_1959_3_14_1_62_0/
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